A handful of US counties or independent municipalities with populations of 100,000 or more can now claim that a majority of their residents hold college degrees. The national average for attainment of a four-year college degree now stands at 27.5% of all adults, up from eight percent in 1960.

Five of the counties and municipalities with majorities who are college graduates are in the Washington, DC area. Great school systems and universities in these areas? Perhaps, but more likely is the high concentration of government agencies, contractors, consultants, associations, and independent think tanks that make the Washington region a big draw for college-trained professionals.

The counties where a majority of residents have college degrees include the following: